AUDIO AND VISUAL SYSTEM, Diagnostic DTC:B1324, B1325

DTC Code DTC Name
B1324 Lost Communication with Meter
B1325 Lost Communication with HUD

DESCRIPTION

These DTCs are stored when communication between the radio and display receiver assembly and meter circuit plate or combination meter mirror ECU is not possible.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1324 Lost Communication with Meter After the radio and display receiver assembly receives a registration information signal, which is sent by the meter circuit plate when the power switch is on (ACC), 1 or more times, the radio and display receiver assembly does not receive the signal for 30 seconds or more.

  • Local bus communication line

  • Meter circuit plate power source circuit

  • Meter circuit plate

  • Radio and display receiver assembly

  • Harness or connector
B1325 Lost Communication with HUD After the radio and display receiver assembly receives a registration information signal, which is sent by the combination meter mirror ECU when the power switch is on (ACC), 1 or more times, the radio and display receiver assembly does not receive the signal for 30 seconds or more

  • Local bus communication line

  • Combination Meter Mirror ECU power source circuit

  • Combination Meter Mirror ECU

  • Radio and display receiver assembly

  • Harness or connector

Tech Tips

The radio and display receiver assembly is the master unit.

WIRING DIAGRAM

A003KTDE10

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    2. Recheck for DTCs and check that no DTCs are output.


      Body Electrical > Navigation System > Trouble Codes
      Result
      Result Proceed to
      DTC B1324 and B1325 are not output A
      DTC B1324 and B1325 are output B
      DTC B1324 is output C
      DTC B1325 is output D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE POWER SOURCE) Click here

    D

    CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU POWER SOURCE) Click here

    B

  2. CHECK LOCAL BUS


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-2 - I84-13 Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result Proceed to
      OK A
      NG (Below 54 Ω) B
      NG (70 Ω or higher) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-2 - I84-13 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-1 - I84-12 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Disconnect the G8 combination meter mirror ECU connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-3 - I84-14 Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-3 - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-14 - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-3 - G8-1 (B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      I84-14 - G8-1 (B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 12 JUNCTION CONNECTOR

    NG

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the G8 combination meter mirror ECU connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-7 (LCL+) - G8-8 (LCL-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER MIRROR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I6 meter circuit plate connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I6-33 (MSCH) - I6-34 (MSCL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE METER CIRCUIT PLATE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I99 radio and display receiver assembly connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I99-3 (CNH1) - I99-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I99 radio and display receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I99-3 (CNH1) - I99-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

  10. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Connect the I99 radio and display receiver assembly connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-2 - I84-13 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 12 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE POWER SOURCE)


    1. Disconnect the I6 meter circuit plate connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I6-28 (ES) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I6-22 (B) - Body ground Power switch off 11 to 14 V
      I6-21 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Connect the I6 meter circuit plate connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-1 - I84-12 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR) Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-2 - I84-13 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 12 JUNCTION CONNECTOR

    NG

  14. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I99 radio and display receiver assembly connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I99-3 (CNH1) - I99-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I6 meter circuit plate connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I6-33 (MSCH) - I6-34 (MSCL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE METER CIRCUIT PLATE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU POWER SOURCE)


    1. Disconnect the G8 combination meter mirror ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-6 (ES) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G8-1 (B) - Body ground Power switch off 11 to 14 V
      G8-2 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Connect the G8 combination meter mirror ECU connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-3 - I84-14 Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-3 - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-14 - Body ground Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I84-3 - G8-1 (B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      I84-14 - G8-1 (B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - NO. 12 JUNCTION CONNECTOR) Click here

    OK

  18. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I84 No. 12 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I84-2 - I84-13 Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 12 JUNCTION CONNECTOR

    NG

  19. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the I99 radio and display receiver assembly connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I99-3 (CNH1) - I99-4 (CNL1) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - NO. 12 JUNCTION CONNECTOR)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the G8 combination meter mirror ECU connector.

    3. Connect the I84 No. 12 junction connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-7 (LCL+) - G8-8 (LCL-) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER MIRROR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR